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Fair Value Measurements - Fair Value of Available-for-Sale Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jan. 30, 2021
Aug. 01, 2020
Debt Securities, Available-for-sale [Line Items]    
One Year or Less $ 166,957 $ 143,037
Over One Year Through Five Years 62,395 95,097
Over Five Years 0 0
Total 229,352 238,134
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
One Year or Less 70,397 38,794
Over One Year Through Five Years 0 29,056
Over Five Years 0 0
Total 70,397 67,850
Certificates of deposit    
Debt Securities, Available-for-sale [Line Items]    
One Year or Less 11,350 6,150
Over One Year Through Five Years 0 0
Over Five Years 0 0
Total 11,350 6,150
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
One Year or Less 41,987 35,331
Over One Year Through Five Years 0 0
Over Five Years 0 0
Total 41,987 35,331
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
One Year or Less 6,095 6,657
Over One Year Through Five Years 16,851 38,603
Over Five Years 0 0
Total 22,946 45,260
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
One Year or Less 37,128 56,105
Over One Year Through Five Years 45,544 27,438
Over Five Years 0 0
Total $ 82,672 $ 83,543